Voltage Regulators MCQ

Test your knowledge with important Voltage Regulators MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Voltage Regulators MCQs at Bissoy

• In the IC 7805, what is the minimum input voltage for proper functioning?
  ক

  5V

  খ

  6V

  গ

  7V

  ঘ

  8V
• What is the output of the IC 7924?
  ক

  12V

  খ

  -12V

  গ

  24V

  ঘ

  -24V
• In a transistorized series regulator, how is the overload and short-circuit protection provided?
  ক

  By the use of a thermistor

  খ

  By using two additional diodes and a current sensing resistor to protect the series transistor

  গ

  By using a diode and an additional resistor to protect the transistor

  ঘ

  By using a diode along with a capacitor of a small capacitance value in series
• What is not related to a transistorized series regulator?
  ক

  The output can be varied by using a variable resistor

  খ

  The output is independent of temperature

  গ

  The overload and short circuit protection is not required

  ঘ

  The circuit has negative feedback responsible for regulation
• The following is a shunt regulator. Find maximum power dissipation of the Zener diode and transistor, given that the source voltage varies from 20-40V, the Zener breakdown voltage is 5V, the output voltage is 10V, the resistance R1=50Ω, R2=20kΩ, β=99, VBE=0.5V.
  ক

  PTransistor = 5.12 W, PZener = 0.051 W

  খ

  PTransistor = 0.41 W, PZener = 0.57 W

  গ

  PTransistor = 5.94 W, PZener = 0.057 W

  ঘ

  PTransistor = 6.22 W, PZener = 5.66 W
• Consider the circuit shown and find the percentage increase in power dissipation of the transistor if the source voltage increases by 10%. Given that the breakdown voltage is 5V, R1=10kΩ, R2=100kΩ, R3=200kΩ, R4=10Ω. The source voltage VS=25V.
  ক

  10%

  খ

  20.22%

  গ

  14.28%

  ঘ

  15.66%
• In the Zener controlled series regulator shown below, find the current through the Zener diode. Given that the Zener diode breakdown voltage is 5V, the source voltage is 15V, the output voltage is 10V, R4 = 2kΩ, β=99, R1=2kΩ.
  ক

  5.05 mA

  খ

  4.95 mA

  গ

  3.33 mA

  ঘ

  0
• Consider the following circuit. Find the power dissipation of the transistor given that the diode breakdown voltage is 5V, R1=20kΩ, R2=100kΩ, R3=200kΩ, R4=10Ω. The source voltage VS=20V.
  ক

  12.12W

  খ

  9.375W

  গ

  9.27W

  ঘ

  10.575W
• Consider the op-amp circuit shown. The breakdown voltage of the Zener is 5V. β for the transistor is 100. R1=10kΩ, R2=90kΩ, R3=30kΩ, R4=50kΩ. Calculate the total output voltage.
  ক

  20V

  খ

  30V

  গ

  5V

  ঘ

  50V
• In a power supply, the output voltage can vary due to multiple reasons. Which of these is not true if it is found that the output voltage is constant?
  ক

  The voltage stability factor is very high

  খ

  The output resistance is zero

  গ

  The temperature coefficient is zero

  ঘ

  The voltage stability factor is very small
• Which of these is a not drawback of Zener diode shunt regulator?
  ক

  The output voltage is fixed

  খ

  The output voltage can vary with temperature

  গ

  Variation in load current needs to be minimal

  ঘ

  It is difficult to design
• In the figure below, the voltage V1 ranges from 15 to 35V. The load current is 20mA. The diode knee current is 2 mA, the breakdown voltage is 5V and power rating is 200 mW. Calculate the range of R2 for the circuit to behave properly as a regulator.
  ক

  400Ω =< R2 =< 500Ω

  খ

  450Ω =< R2 =< 500Ω

  গ

  454Ω =< R2 =< 500Ω

  ঘ

  454Ω =< R2 =< 600Ω
• The following circuit is provided. Given that V1 varies from 20V to 50V, the diode breakdown voltage is 5V, the knee current is 1mA and the current is 9 mA across R1, find the maximum value of R2.
  ক

  4500Ω

  খ

  1500Ω

  গ

  2000Ω

  ঘ

  5000Ω
• Find the power rating of the diode in the given circuit. The breakdown voltage of the diode is 5V.
  ক

  200 mW

  খ

  125 mW

  গ

  250 mW

  ঘ

  300 mW
• What is load regulation?
  ক

  The process of keeping the load voltage constant irrespective of any change in AC supply

  খ

  The process of keeping the load voltage constant irrespective of variations in load current

  গ

  The process of keeping load voltage constant irrespective of variations in source current

  ঘ

  The process of keeping load current constant irrespective of variations in AC supply
• What is line regulation?
  ক

  The process of keeping Zener diode voltage constant inspite of changes in AC supply

  খ

  The process of keeping load voltage constant irrespective of the fluctuation in AC supply or the line voltage

  গ

  The process of keeping load voltage constant irrespective of fluctuation in load current

  ঘ

  The process of keeping Zener current constant irrespective of fluctuation in AC supply
• For a Zener diode shunt regulator, the source current is IS, the Zener diode current is IZ and the load current is IL. The source voltage is VS, Zener voltage is VZ and load voltage is VL. The load resistance is RL. What is the correct option for the safe operation of the diode?
  ক

  IS = IZ + IL

  খ

  IS =< IZmax + IL

  গ

  IS =< IZmin + IL

  ঘ

  VL = VZ
• Consider the circuit shown below where the breakdown voltage of the diode is 5V. Source voltage varies between 6V to 12V. Find the maximum current through the R2, given that R1=2kΩ and R2=5kΩ.
  ক

  3.5 mA

  খ

  1 mA

  গ

  1.4mA

  ঘ

  0.2 mA
• What is IC 723?
  ক

  A voltage regulator

  খ

  A full-wave rectifier

  গ

  A half-wave rectifier

  ঘ

  A clipper